Canon XLIV.
The Quinisext Council in Trullo (692) · The Seven Holy Ecumenical Councils
A monk convicted of fornication, or who takes a wife for the communion of matrimony and for society, is to be subjected to the penalties of fornicators, according to the canons.
Trull 1.45.2
A monk joined in marriage or committing fornication shall pay the penalty of a fornicator.
Trull 1.45.5
The punishment here seems too light, so that Balsamon thinks that this canon only refers to such monks as freely confess their sin and desist from it, remaining in their monasteries; and that the sterner penalties assigned to unchaste religious by other synods (notably Chalcedon, can. xvj., and Ancyra, can. xix.) are for such as do not confess their faults but are after some time convicted of them.
Trull 1.45.6
The monk will receive the same punishment whether he be a fornicator or has joined himself with a woman for the communion of marriage.
Trull 1.45.8